Question

A) -3(2x=3)=-(x+2)+5 b) -4(2x+3)=-(x+1)2-3 c) -7(-3x+2)=(x+3)-(x-2) d)-(x+2)+(x+4)=4(x+1) e) -(3x-2)=21x(X+3) f) -1/2(6x+12)=-1/3(9x+12)+4 g) -1/8(8x-16)=1/2 h) (4x+24)=x+2x

Answer 1

a)      -3(2x+3)=-(x+2)+5

-6x  - 9 = - x – 2 +5

-6x +x = 3 + 9

-5x = 12

x = -12/5 = -2 i 2/5

 

b)      -4(2x+3)=-(x+1)2-3

-8x – 12 = -2 x – 2 – 3

-8x + 2x = -5 +12

-6x = 7

x= -7/6

 

c) -7(-3x+2)=(x+3)-(x-2)

21x – 14 = x + 3 – x + 2

21x = 5+14

21x = 19

X = 19/21

 

d)-(x+2)+(x+4)=4(x+1)

-x – 2 + x + 4 = 4x + 4

2 = 4x +4

4x = 2-4

4x = -2

x = -2/4

x= -1/2

 

f) -1/2(6x+12)=-1/3(9x+12)+4

-3x – 6 = -3x -4+4

-3x +3x = 6

0=6

sprzeczne

 

g) -1/8(8x-16)=1/2

-x + 2 = 1/2    /*2

-2x + 4 = 1

-2x = 1-4

-2x = -3   /: (-2)

x = 3/2

 

 h) (4x+24)=x+2x

4x +24 = x + 2x

4x -3x = -24

x = -24